Binding post



H. H. EBY

BINDING POST Aug. 31, 1926.

Filed Feb. 4, 1922 WITNESSES: M \2 3. )J

Patented Aug. 31, 1926.

UNITED STATES PATENT OFFICE.

BINDING ros'r.

Application filed February 4, 1922. Serial No. 534,188.

The invention relates to binding posts as used in the electrical industry with electrical apparatus for securing an efficient electrical connection.

It has for its object a. binding post which will receive and securely hold an electrical conductor equally well, whether large or small, which the binding postwill accommodate without looping or bending the conductor and without injuring the conductor.

Large contact surfaces are provided and, with direct screw pressure, insure a positive contact.

A further object of this invention is to so design a binding-post whose cap or clamping element will not come off the post or e bent. The post also presents a clean, smooth finish as no threads are exposed to collect dirt, grease, etc. The ease of operation eliminates any injury to the fingers.

The invention will be better understood when described in connection with the drawm Fig. 1 shows a partly sectioned elevation of the metallic portion of the top screw contact.

Fig. 2 shows a partly sectioned elevation of the metallic portion of the .botton contact.

Fi 3 shows a bottom plan view of the meta lic portion of the bottom contact.

Fig. 4 shows an elevation of the screw p Fig. 5 shows an assembly of Figs. '1, 2 and 4, the arts being partly sectioned.

Fig. 6 siiows a partly sectioned elevation of Fig. 1 with insulation thereon,

Fig. 7 shows a bottom plan view of Fig. 6. Fig. 8 shows a partly sectioned elevation of Flg. 2 with insulation thereon.

Fig. 9 shows a bottom plan-"view of Fig. 8. Fig. 10 shows an elevationof the assembled post.

Referring again'to the drawings; Fig. 4 shows the body portion 6 of the post proper which is threaded at the upper end at 9 to receive contact cap 7 (Fig. 1) which is correspondingly threaded internally over its in-- ner portion at 10 with the same size of thread as on the post. The post is provided with a shoulder at 12 which is enaged by the flange 11 on cap 7 (Fig. 1) to' 1mit the upward movement of the cap when said cap is raised by the screw actlon to which affords a end of the ing prevent removal of the cap. In this form the post is inserted from the top of the cap.

The post 9 (Fig. 4') has a second shoulder 13 at an intermediate point in its length stop to determine the position of the lower contact member 8. The lower contact member at 14 to fit over a thread 15 upon the lower post and when secured to its desired position upon the post ma be held there by upsetting the threads or by sweatmg it in position. 0 At a point 16 in the length of the post ust above the upper surface of the lower member 8, an aperture is formed through whlch a conductor is passed which conductor is to be clamped between the two facing surfaces of the lower and upper contact elements.

The lower contact element is grooved at 17 and is flattened in its lower part at 18 for the purpose of better retaining a cover of insulating. material 22 within which is placed a pin 19 intended to cooperate with the support to prevent turning of the binding post.

he upper contact member is knurled at 20 to recelve and retainan insulating cover- 21 which closes the upper end of the upper contact member against withdrawal 0 the binding post upwardly. The insulating material 21 of the upper contact member gives a larger and better holding surface for screwin the cap home and gives finish to the bin ing post as does the lower insulating material 22 about the lower contact member.

I show nuts 23 and washers 24 for holding'the binding post in position and securing the electrical connection.

As thus presented the plain surface 25 is the only-surface of the post 7 which is exposed when the cap is screwed up, so that the conductor is protected against engagement with binding post threads. The cap is protected against withdrawal.

I claim:

1. A binding post comprising a body portion threaded externally at both ends and two plain intermediate portions of difi'erent diameter forming ashoulder between the plain portions, in combination with means for holding the binding (post in position,'engaging one threaded en and a cap engagis internally threaded I ing the other threaded end, fittin over and close to the plain portion of sm ler diameter, engagin the other thread and having an inwardly irected shoulder to engage the shoulder between the two plain portions.

2. A binding post stem threaded at both ends and having a plain portion adjacent the one thread and a shoulder between this lain portion and the other thread, in com ination with a cap member engaging the second thread to move u on it during operation and having an 'inwar ly directed shoulder to engage the shoulder first named. 7

3. In a binding post a stem having one end fitted for attachment of the post, the

bination wlth a cap member forming in normal operation threaded engagement withthe thread of the stem and havin turned flange fitting close to the p ain portion and engaging the shoulder at its outer t. Signed at Philadelphia, in the county of Philadelphia and State of Pennsylvania this 18th day of July, 1921.

HUGH H. EBY. 

